Release of contents due to container stresses is best described as which mechanism?

• A. Thermal
• B. Chemical
• C. Mechanical
• D. Magnetic

Answer: (A)

The main idea is that heat-induced stress on a container can cause it to fail. When a container is heated, the material expands. If the container, its closures, or fittings can’t accommodate that expansion, internal and wall stresses build up until the container yields or ruptures, allowing the contents to escape. This scenario is driven by temperature effects, so it’s described as thermal.

If it were mechanical, the release would come from an external impact or puncture independent of temperature; if chemical, from a chemical reaction weakening the container; magnetic is not a typical release mechanism.